<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<style>
  html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    background: #00000c;
    overflow: hidden;
    background: linear-gradient(to bottom,
    #00000c,
    #020111 85%, #191621 100%,
    #020111 60%, #20202c 100%,
    #020111 10%, #3a3a52 100%,
    #20202c 0%, #515175 100%,
    #40405c 0%, #6f71aa 80%, #8a76ab 100%,
    #4a4969 0%, #7072ab 50%, #cd82a0 100%,
    #757abf 0%, #8583be 60%, #eab0d1 100%,
    #82addb 0%, #ebb2b1 100%,
    #94c5f8 1%, #a6e6ff 70%, #b1b5ea 100%,
    #b7eaff 0%, #94dfff 100%,
    #9be2fe 0%, #67d1fb 100%,
    #90dffe 0%, #38a3d1 100%,
    #57c1eb 0%, #246fa8 100%,
    #2d91c2 0%, #1e528e 100%,
    #2473ab 0%, #1e528e 70%, #5b7983 100%,
    #1e528e 0%, #265889 50%, #9da671 100%,
    #1e528e 0%, #728a7c 50%, #e9ce5d 100%,
    #154277 0%, #576e71 30%, #e1c45e 70%, #b26339 100%,
    #163C52 0%, #4F4F47 30%, #C5752D 60%, #B7490F 80%, #2F1107 100%,
    #071B26 0%, #071B26 30%, #8A3B12 80%, #240E03 100%,
    #010A10 30%, #59230B 80%, #2F1107 100%,
    #090401 50%, #4B1D06 100%,
    #00000c 80%, #150800 100%,
    #00000c);
    animation: gradientAnimation 15s ease infinite;
  }
  @keyframes gradientAnimation {
    0% {
      background-position: 0 50%;
    }
    50% {
      background-position: 100% 50%;
    }
    100% {
      background-position: 0 50%;
    }
  }
</style>
<body>

</body>
</html>